ref: 52a39f75f25e3c596b39ceff4d07c22c58d90c18
parent: ff1083c11343da3e87602c3940afa523abd7266a
author: Yaowu Xu <yaowu@google.com>
date: Tue Oct 15 07:05:06 EDT 2013
Added trap for invalid key frame Change-Id: I698e8df9b336d38bffe01e656acba00d4003695f